diff --git a/app/models/config.py b/app/models/config.py
index 84ad0e4..3898ae7 100644
--- a/app/models/config.py
+++ b/app/models/config.py
@@ -18,6 +18,7 @@ class Config:
             'WHOOGLE_CONFIG_STYLE',
             open(os.path.join(app_config['STATIC_FOLDER'],
                               'css/variables.css')).read())
+        self.block = os.getenv('WHOOGLE_CONFIG_BLOCK', '')
         self.ctry = os.getenv('WHOOGLE_CONFIG_COUNTRY', '')
         self.safe = read_config_bool('WHOOGLE_CONFIG_SAFE')
         self.dark = read_config_bool('WHOOGLE_CONFIG_DARK')
diff --git a/app/request.py b/app/request.py
index b4c67dd..6fabe46 100644
--- a/app/request.py
+++ b/app/request.py
@@ -120,6 +120,10 @@ def gen_query(query, args, config, near_city=None) -> str:
     ) if config.lang_interface else ''
     param_dict['safe'] = '&safe=' + ('active' if config.safe else 'off')
 
+    # Block all sites specified in the user config
+    for blocked in config.block.split(','):
+        query += (' -site:' + blocked) if blocked else ''
+
     for val in param_dict.values():
         if not val:
             continue
diff --git a/app/routes.py b/app/routes.py
index 053cb72..7867442 100644
--- a/app/routes.py
+++ b/app/routes.py
@@ -2,7 +2,6 @@ import argparse
 import base64
 import io
 import json
-import os
 import pickle
 import urllib.parse as urlparse
 import uuid
@@ -17,7 +16,7 @@ from app import app
 from app.models.config import Config
 from app.request import Request, TorError
 from app.utils.bangs import resolve_bang
-from app.utils.session import valid_user_session
+from app.utils.session import generate_user_key, valid_user_session
 from app.utils.search import *
 
 # Load DDG bang json files only on init
diff --git a/app/templates/index.html b/app/templates/index.html
index 3625719..9d43988 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -106,6 +106,10 @@
 				    <label for="config-near">Near: </label>
 				    <input type="text" name="near" id="config-near" placeholder="City Name" value="{{ config.near }}">
 				</div>
+                <div class="config-div config-div-block">
+                    <label for="config-block">Block: </label>
+                    <input type="text" name="block" id="config-block" placeholder="Comma-separated site list" value="{{ config.block }}">
+                </div>
 				<div class="config-div config-div-nojs">
 				    <label for="config-nojs">Show NoJS Links: </label>
 				    <input type="checkbox" name="nojs" id="config-nojs" {{ 'checked' if config.nojs else '' }}>
diff --git a/app/utils/search.py b/app/utils/search.py
index b71e6dd..a856bf6 100644
--- a/app/utils/search.py
+++ b/app/utils/search.py
@@ -1,5 +1,4 @@
 from app.filter import Filter, get_first_link
-from app.utils.session import generate_user_key
 from app.request import gen_query
 from bs4 import BeautifulSoup as bsoup
 from cryptography.fernet import Fernet, InvalidToken